Sandhill Co$.$ purchased equipment for $$611,200$ which was estimated to have a useful life of $10$ years

with a salvage value of $$12,000$ at the end of that time. Depreciation has been entered for $7$ years on a

straight$-$line basis. In $2026,$ it is determined that the total estimated life should be $15$ years with a

salvage value of $$5,400$ at the end of that time.

$($a$)$ Prepare the entry $($if any$)$ to correct the prior years' depreciation.

$($b$)$ Prepare the entry to record depreciation for $2026.$